The Internet has contributed to a dramatic increase in trademark infringement. The difficulty of seeking out online infringers, however, complicates the process of bringing a direct infringement claim. As a result, stakeholders have resorted to secondary trademark liability, predicated on the role played by online intermediaries in expanding the reach of the alleged direct infringers. Our 2013 Symposium will explore the contours of secondary liability for trademark infringement online from domestic and international perspectives. In the morning, we will look at the law of secondary liability in the US, Europe, and the Far East, and discuss the complex international dimensions of online trademark infringement cases. The afternoon will be devoted to proposals for a secondary liability regime that would better secure the rights of trademark owners without interfering with the Internet marketplace.